An experiment that ran for 151 days produced signals that suggested the presence of one of these constructs named after a holiday. That experiment is consistent with the proposed upper limit for the number of these constructs, which is one per 10-to-the-29 nucleons. The expression [read slowly] “2 q-sub-e q-sub-m all over h-bar c” must be an integer in a physicist’s (15[1])namesake quantization condition involving these constructs. (*) Dyons with no electrical charge are equivalent to these particles. To explain the topological properties of these particles, Dirac proposed (10[1])his namesake “strings.” The existence of these particles does not agree (10[1])with Gauss’s law because the divergence of the magnetic field would be non-zero. For 10 points, name these particles that only contain a north or south pole, unlike magnetic dipoles. ■END■