/kwȯ(r)-tər/
noun — “a fractional coin of memory, equal to two bits and historically more interesting than it has any right to be.”
Quarter is hacker slang for a quantity of 2 bits. The term is rooted in older monetary metaphors that predate computing itself, borrowing from the idea of fractional currency and physical coinage that could be subdivided into smaller pieces for making change.
The historical reference point is the Spanish piece of eight, a widely circulated silver coin in the colonial era. These coins were often physically broken into eight wedge-shaped segments, each segment representing a “bit” of the whole. In early American usage, the full coin was treated as roughly equivalent to one dollar, making each segment worth about 12.5 cents.
From that tradition, the notion of a quarter emerged as a convenient fractional unit—literally a piece of value, later repurposed in hacker jargon as a compact way of referring to a small binary quantity.
Numerically, in computing terms:
1 quarter = 2 bits
= 1 crumb
= 1 tayste
= 1/2 nybbleAnd like other 2-bit units, it encodes exactly four possible states:
00 = 0
01 = 1
10 = 2
11 = 3While modern systems rarely name such small groupings explicitly, the structure itself appears constantly. Any compact encoding requiring four options—modes, directions, flags, or configuration states—can naturally be represented in a quarter-sized unit, even if no one calls it that during implementation.
The appeal of the term lies less in technical necessity and more in metaphorical continuity. Early computing culture frequently borrowed from physical-world analogies: bits as coins, bytes as bites, and progressively larger groupings as increasingly absurd meals. The quarter sits awkwardly between finance and food, reflecting both origins at once.
Usage: rare… mostly encountered in historical or humorous contexts rather than active engineering practice.