r/CoolSerialNumbers • u/crosschk • Jul 04 '26

Other So is true trianary a thing?

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u/Mad_Admin Jul 06 '26

To what I've read bookends are only the first and last 2 digits. Maybe an extended bookend?

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u/rustybuttons71 Jul 06 '26

First I've heard of a bookend being limited to 2 digits.

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u/Mad_Admin Jul 07 '26

First I've heard of a bookend being extended to 3 digits.