The ROM include Roman chars and Roman chars with Czech diacritic marks. Non-graphitizing carbons are otherwise known as "chars", "hard carbons" or, more colloquially, charcoal. The treated wood chars but does not oxidize. Harder chars are produced with sodium silicates and graphite. They are not as piscivorous or aggressive as brown trout or chars. Sedimentary islands in the Ganges delta are called chars. Intumescents that produce hard chars are unsuitable for interior spray fireproofing. The sandbars, known in Bengali as "chars", do not occupy a permanent position. It is composed of a labyrinth of channels, swamps, lakes, and flood plain sediments (chars). About 20,000 people live on "chars". Entire alternative fonts can be loaded into RAM and the CHARS variable re-pointed accordingly. "CHARS 1" declares that one character will follow.