(physics) A stable isotope ⁶₃Li, having three protons and three neutrons, that makes up about 7% of natural lithium; it is used in the nuclear industry.

(psychology) The 1949 revision of the International Classification of Diseases, published by WHO.

(music) A meter of six eighth notes per measure, usually with secondary stress on the fourth eighth note.

Alternative form of six foot

The attack against the United States Congress at the Capitol on January 6, 2021.

Alternative spelling of grade six

Under the Whyte notation system, a Garratt steam locomotive that is articulated in three parts, with a boiler mounted on the centre frame, and two steam engines mounted in opposite directions on separate frames, one on each end of the boiler, and each engine having a 2-6-4 wheel configuration.

plural of 2-6-0+0-6-2

plural of 4-6-2+2-6-4

Under the Whyte notation system, a Garratt steam locomotive that is articulated in three parts, with a boiler mounted on the centre frame, and two steam engines mounted in opposite directions on separate frames, one on each end of the boiler, and each engine having a 2-6-0 wheel configuration.