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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. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| dead reckoning | |
| —n | |
| a method of establishing one's position using the distance and direction travelled rather than astronomical observations | |
dead reckoning
determination without the aid of celestial navigation of the position of a ship or aircraft from the record of the courses sailed or flown, the distance made (which can be estimated from velocity), the known starting point, and the known or estimated drift
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