Nerdy hexagonal promo stickers that tesselate, for people who find it needful to promote things tesselated, and also honey bees. The specifications ensure that this remains standardised, and the full standard is excellent, including such clauses as section 2.
When you exchange stickers, you may be given a sticker that does not conform to this specification. If this is the case, thank them for the time spent on designing and printing the sticker.
Emi Tanaka explains and gives a powerpoint template that is useful for this purpose
The R package hexSticker automates some tedious steps.