"Yahrzeit" (year's time) is the anniversary of the parent's death. On the evening preceding, a light is kindled in the house, and kept burning until the following sundown. Synagogue service in the morning and evening is also attended, and the kaddish recited. "Nahala" (inheritance) is the poetic equivalent of the Spanish and Portuguese Jews for the Teutonic Yahrzeit.
Source: wiktionary