paper measurements

Prompted by a cropped word photo, thought it was time to 
add some paper sizes / measurements information here:

source

quire¹

n

1. (Communication Arts / Printing, Lithography & Bookbinding) a set of 24 or 25 sheets of paper; a twentieth of a ream

2. (Communication Arts / Printing, Lithography & Bookbinding)

a.  four sheets of paper folded once to form a section of 16 pages

b.  a section or gathering

3. (Communication Arts / Printing, Lithography & Bookbinding) a set of all the sheets in a book

[C15 quayer, from Old French quaier, from Latin quaternī four at a time, from quater four times] (source)

Writing paper measurements

25 sheets = 1 quire

500 sheets = 20 quires = 1 ream

1,000 sheets = 40 quires = 2 reams = 1 bundle

5,000 sheets = 200 quires = 10 reams = 5 bundles = 1 bale

'Short' paper measurements^[1]

24 sheets = 1 'short' quire

480 sheets = 20 'short' quires = 1 'short' ream

960 sheets = 40 'short' quires = 2 'short' reams = 1 'short' bundle

4,800 sheets = 200 'short' quires = 10 'short' reams = 5 'short' bundles = 1 'short' bale

Posters and printing measurements

516 sheets (= 21½ 'short' quires) = 1 printer's ream

1,032 sheets = 2 printer's reams = 1 printer's bundle

5,070 sheets = 5 printer's bundles = 1 printer's bale

(source)