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It is an upside down 'T'
A horizontal line with a vertical line drawn straight down to intersect and stop at the middle of the horizontal line. I'll try to do it here:

l

l

l

-------

Obviously this is written with complete, not dotted lines, that touch each other. But that is the best I can do.

Picture an upside down capital letter "T". I'm a sixth grade math teacher, we frequently use this.

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8y ago
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