L-radiation

L-ra·di·a·tion

[el-rey-dee-ey-shuhn]
noun Physics.
See under L-line.
Dictionary.com Unabridged

L-line

[el-lahyn]
noun Physics.
one of a series of lines (L-series) in the x-ray spectrum of an atom corresponding to radiation (L-radiation) caused by the transition of an electron to the L-shell.

Origin:
1965–70

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To l-radiation
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L-radiation is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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