What is "mount calm"

Population (2000): 310
Housing Units (2000): 138
Land area (2000): 0.833725 sq. miles (2.159337 sq. km)
Water area (2000): 0.003252 sq. miles (0.008423 sq. km)
Total area (2000): 0.836977 sq. miles (2.167760 sq. km)
FIPS code: 49692
Located within: Texas (TX), FIPS 48
Location: 31.757680 N, 96.881931 W
ZIP Codes (1990): 76673
Note: some ZIP codes may be omitted esp. for suburbs.
Headwords: