There is one exception to the rule about symbols not starting with a capital letter (unless they are named after a person). This exception involves the symbol for the litre. The symbol for the litre is not named after a person and technically its correct symbol should be the letter l (lower case). But you can see how easily this can be confused with the number 1, depending on the typeface used. So we can use the capital letter L as the symbol for the 'litre'. This means that the symbol for the litre can either be l or L and both forms are acceptable.
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