Other
- Location identifier, in aviation
- Low-iodine diet, a diet low in iodine, as recommended before having a thyroid cancer screening
- A poor operator; one who is inept at the practice of the practice/art in the amateur radio service (derogatory)
- Live In Digger, a derogatory term used to refer to a Private in the Australian Army who has served for less than one year
- In the 1960s, a "lid" was one ounce of cannabis (average price $15); by the 2000s, because of higher prices and the advent of plentiful medical marijuana, a lid came to be redefined as one-eighth of an ounce of cannabis (average price $60), while eight 2000s lids or a whole ounce averages $300
- Colloquial term for capping inversion, inhibits atmospheric convection
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