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Isogram

noun

Noun

1
A word in which no letter of the alphabet occurs more than once.
"For convenience, we can refer to an isogram of order n as an n-isogram. The examples in (2a) are 1-isograms, (2b) 2-isograms, and (2c) 3-isograms. Second- and third-order isograms are also sometimes referred to as pair and trio isograms respectively, but I will not use these terms here."
2
a line drawn on a map connecting points having the same numerical value of some variable wordnet
3
A line on a map or chart, such as a contour line, joining points that have the same value for some quantity.

From iso- + -gram. The "contour line" sense was proposed in 1889 by Francis Galton.

Unscramble this word: isogram