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| 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. |
| a fool or simpleton; ninny. |
| extremely low frequency | |
| —n | |
| ELF a radio frequency or radio-frequency band below 3 kilohertz | |