hash mark

noun

Informal.

a service stripe.

the symbol #.

Football. the marking formed by either inbounds line intersecting with one of the lines delineating yardage between the goal lines.

Origin:
1905–10

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To hash mark

Collins

World English Dictionary

hash or hash mark³ (hæʃ)

—n
1.	the character (#) used to precede a number
2.	this sign used in printing or writing to indicate that a space should be inserted

hash mark or hash mark³

—n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10

Hash mark is always a great word to know.

So is quincunx. Does it mean:

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

a gadget; dingus; thingumbob.

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