What is "naplate"

Population (2000): 523
Housing Units (2000): 252
Land area (2000): 0.111952 sq. miles (0.289955 sq. km)
Water area (2000): 0.000000 sq. miles (0.000000 sq. km)
Total area (2000): 0.111952 sq. miles (0.289955 sq. km)
FIPS code: 51648
Located within: Illinois (IL), FIPS 17
Location: 41.331269 N, 88.878932 W
ZIP Codes (1990):
Note: some ZIP codes may be omitted esp. for suburbs.
Headwords: