setNumberSymbol(sType, sSymbol) {
			check(["group", "decimal", "plusSign", "minusSign"].includes(sType), "sType must be decimal, group, plusSign or minusSign");
			_set("symbols-latn-" + sType, sSymbol);
		}
Defines the string to be used for the given number symbol.

Calling this method with a null or undefined symbol removes a previously set symbol string.
Note that an empty string is explicitly allowed.

If a symbol is defined, it will be preferred over symbols derived from the current locale.

See class {@link sap.ui.core.format.NumberFormat NumberFormat} for details about the symbols.

After changing the number symbol, the framework tries to update localization
specific parts of the UI. See the documentation of
{@link module:sap/base/i18n/Localization.setLanguage Localization.setLanguage()}
for details and restrictions.

@param {"group"|"decimal"|"plusSign"|"minusSign"} sType the type of symbol
@param {string} sSymbol will be used to represent the given symbol type
@public
@since 1.120