| nuclear fission | |
| —n | |
| Compare nuclear fusion Sometimes shortened to: fission the splitting of an atomic nucleus into approximately equal parts, either spontaneously or as a result of the impact of a particle usually with an associated release of energy | |
| 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. |