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HO Scale's name comes from being Half of O scale. HO is the most popular model railroad scale in continental Europe and North America.

Introduced by Märklin around 1900, by the 1930s O gauge was the most common railroad scale in the U.S. and remained so until the early 1960s.

1:24 scale is very close to the scale (1:22.5) used for G scale narrow-gauge model trains, so 1:24 models are often used on model train layouts. 

G scale was introduced in 1968 by Ernst Paul Lehmann Patentwerk, a German firm that produced G-scale items under the brand name LGB,

Fn3 stands for "F" Scale (1:20.3, which is just a proportion of its size to the real thing's) "n" stands for narrow gauge, &  "3" stands for 3 feet between the rails.