Placing call numbers or location numbers on items to be filed allows them to be separated from other items while placing cross-references or links allows them to be brought back together again. These two affordances allow for divergence as well as convergence of items or ideas.

While some sources (which? Kaiser implies that there are some, though they may have been based on anecdotal evidence) apparently recommend to use one number for each firm, Kaiser admonishes users to stay away from this rule as not all firms will also take up space within each particular category. He recommends using consecutive numbering within each category so that there are no gaps. This lack of any gaps will reveal in the future when things may be missing from one's system.

In describing classification schemes for card index-based business uses, Julius Kaiser indicated in 1908 that "elaborate library classifications were either inapplicable or much too complicated and therefore unmanageable." This is in part because of the standardization of the Dewey Decimal System, which may have provided efficiencies for library systems, but proved too rigid for the idiosyncrasies of a variety of businesses. Instead he describes an alpha-numeric system in which numbers provide simple means of finding while the initial alphabetic codes assign specific office-related classes (correspondence, press cuttings, catalogs, etc.) to the indexed materials.

@Nori said: First, if you instead of an alphanumeric ID use a timestamp-based one, there is no need to “place” the note anywhere.

Too often I see this generic advice to use a timestamp ID, but no one ever mentions what affordance that practice provides or any direct motivation for doing it. In this context it's suggested to remove the need to place the note anywhere, but if this is the only benefit, why bother having an ID at all? What other tangible benefits does a timestamp ID provide? (If the only benefit is having a record of creation, then why bother to put it into the title, which usually only causes confusion and problem in most digital systems? Digital systems have much better places to store date/time created, modified, etc. if you need them for search.)

In Luhmann's case the alphanumeric ID gave direct benefits in organically creating neighborhoods of ideas in which one could easily travel and which provided concrete, findable locations for search and linking. This appears to be part of the beneficial structure for what @IvanFerrero has, so why suggest such a change @Nori?

Zettlr's maintainer's experience suggests that using complex zettelkasten IDs makes one less likely to assume something about what they mean and thereby making them better suited for cross-linking notes.

Part of this can be read as a means of disassociating the idea of specific topics from the notes on the cards.

reply to u/pakizh at https://www.reddit.com/r/Zettelkasten/comments/16vgxy7/ids_or_common_names_for_notes/

Keyword search was definitely available in Luhmann's lifetime. Here's the link to the digitized version of Luhmann's keyword index: https://niklas-luhmann-archiv.de/bestand/zettelkasten/zettel/ZK_2_SW1_001_V. Versions of this sort of indexing go back at least to John Locke's method for indexing commonplace books in 1685 (in French) and 1706 (in English). See: https://archive.org/details/13925922180LockeCommonplaceBook/mode/2up for the 1706 version. In a zettelkasten context, instead of indexing page numbers, one simply numbers their index cards and the method works exactly the same. (One could also think of it as creating a library card catalog for one's ideas instead of their books—again, using a personalized numbering system instead of the standardized Dewey Decimal System which is used for books.)

In paper versions, the numbers serve two purposes:

• Allowing the ideas to be indexed and searched for and found again. Full text search in digital contexts may be easier in some instances, but these sorts of searches may not scale well over thousands of notes and may return hundreds of results which need to be looked through to find the correct one. As a result, even good indexing in digital can pay off well in the long run.
• Placing similar ideas next to each other (when filed using numbers) allows areas of interest to build up in one's note collection. This also creates what one might call "soft links" between ideas (versus more direct, hard links using [[WikiLinks]] or explicit links to specific numbered cards). These neighborhoods of ideas eventually build up to something interesting in aggregation. Without these sorts of (decimal or alpha-numeric) numbers, it's more difficult to create this affordance in digital applications (and one has to be more vigilant for orphaned notes). One can use tags or category names in Obsidian along with the graph view to approximate some of this affordance, but it requires more work on the part of the user. Prepending sortable numbers onto the titles of notes can allow these neighborhoods to be more visible in the sidebar folder view found in many digital tools.

Some will suggest or use some sort of date/timestamp number as a unique identifier, but doing this generally has little or no value and most digital systems will automatically add date/time creation and modification timestamps to notes anyway if those are of interest or value.

More details: https://boffosocko.com/2022/10/27/thoughts-on-zettelkasten-numbering-systems/

Knowing these potential affordances, try things out for a while to see how they work for you and then decide to continue or change your practice to suit your own needs.

reply to u/OldSkoolVFX at https://www.reddit.com/r/ObsidianMD/comments/11jiein/comment/jb6np3f/?utm_source=reddit&utm_medium=web2x&context=3

I've studied (and used) Luhmann and other related systems more closely than most, so I'm aware of zettelkasten.de and the variety of numbering systems available including how Luhmann's likely grew out of governmental conscription numbers in 1770s Vienna. As a result your answer comes close to a generic answer, but not to the level of specificity I was hoping for. (Others who use a timestamp should feel free to chime in here as well.)

How specifically does the anonymity of the notes identified this way create surprise for you? Can you give me an example and how it worked for you? As an example in my own practice using unique titles in Obsidian, when I type [[ and begin typing a word, I'll often get a list of other notes which are often closely related. This provides a variety of potential links and additional context to which I can write the current note in light of. I also get this same sort of serendipity in the autocomplete functionality of my tagging system which has been incredibly useful and generative to me in the past. This helps me to resurface past notes I hadn't thought of recently and can provide new avenues of growth and expansion.

I've tried the datetime stamp in the past, but without aliasing them all with other titles, things tend to get lost in a massive list of generally useless numbers in an Obsidian folder—i.e. looking at the list gives me absolutely no information without other actions. Further the aliasing to remedy this just becomes extra administrative work. I've also never experienced the sort of surprise you mention when using datetime stamps, or at least not as the result of the timestamps themselves. As a separate concrete example in this video https://share.tube/w/4ad929jjNYMLc6eRppVQmc?start=49s using Denote, there is a clever naming method which simultaneously uses timestamps, Luhmann IDs, titles, and tags. However in this scheme the timestamps is one of the least useful (other than for simply searching by creation date/time, as in "I remember doing this on my birthday last year", or "it was sometime in Winter 2015"...) compared with the Luhmann identifiers, the title, or the tag for search and discovery within the search functionality. Consequently, I'm looking for concrete reasons why people would use datetime stamps and affordances they provide other than to simply have an identifier.

Part 2: Search & Inspect. Denote as a Zettelkasten, 2023. https://share.tube/w/4ad929jjNYMLc6eRppVQmc.

His file naming convention and search operation in this is really fantastic:

20230226155400==51a3b--note-title__tag1_tag2.org

This allows one to search the file by date/time, signature, title or tags, by using the =, - or _ along with text.

Beyond this however, there's a fair amount of context to build to use this system including using regex search.