# Is AC.10 be considered as reserved as for .05 through .08?

**URL:** <https://forum.johnnydecimal.com/t/is-ac-10-be-considered-as-reserved-as-for-05-through-08/2954>\
**Category:** The Johnny.Decimal system\
**Created:** [August 22, 2026, 5:32pm UTC](https://forum.johnnydecimal.com/t/is-ac-10-be-considered-as-reserved-as-for-05-through-08/2954 "2026-08-22T17:32:42Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ajhalili2006](https://forum.johnnydecimal.com/user_avatar/forum.johnnydecimal.com/ajhalili2006/32/2047_2.png) [@ajhalili2006](https://forum.johnnydecimal.com/u/ajhalili2006)\
**Post date:** [August 22, 2026, 5:32pm UTC](https://forum.johnnydecimal.com/t/is-ac-10-be-considered-as-reserved-as-for-05-through-08/2954/1 "2026-08-22T17:32:42Z")

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I am fielding through [The standard zeros • Documentation • Johnny.Decimal](https://johnnydecimal.com/documentation/the-standard-zeros) and since both categories and IDs start at `11` as mentioned there, is catgeory/ID number `10` considered as reserved similar to `05`, `06`, `07`, and `08` but implicit since it’s not directly mentioned?

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**Author:** ![johnnydecimal](https://forum.johnnydecimal.com/user_avatar/forum.johnnydecimal.com/johnnydecimal/32/1759_2.png) [@johnnydecimal](https://forum.johnnydecimal.com/u/johnnydecimal)\
**Post date:** [August 23, 2026, 2:33am UTC](https://forum.johnnydecimal.com/t/is-ac-10-be-considered-as-reserved-as-for-05-through-08/2954/2 "2026-08-23T02:33:27Z")

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It’s the [header](https://johnnydecimal.com/documentation/headers) for the range `.11-.19`, if you need it.

E.g. in my task manager:

![z-CleanShot 2026-08-23 11-33-14@2x](https://forum.johnnydecimal.com/uploads/default/original/2X/6/6471afd0493cb22413e34e721b786a04e6f6ba04.png)

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**Author:** ![ajhalili2006](https://forum.johnnydecimal.com/user_avatar/forum.johnnydecimal.com/ajhalili2006/32/2047_2.png) [@ajhalili2006](https://forum.johnnydecimal.com/u/ajhalili2006)\
**Post date:** [August 23, 2026, 10:07am UTC](https://forum.johnnydecimal.com/t/is-ac-10-be-considered-as-reserved-as-for-05-through-08/2954/3 "2026-08-23T10:07:24Z")

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👀 Thanks for the hint! Currently sorting through my notes on Obsidian and elsewhere (especially on Notion) lately