Symbole général de monnaie (currency sign). Il semble pas avoir de nom.
CURRENCY SIGN U+00A4 ¤ octal: 244
This character is a currency symbol to which no definite semantics has been assigned. It is used very rarely. The most natural semantics for it would probably be that it is a generic currency symbol: a placeholder for actual currency symbols. But there is very little such usage in reality. However, localization settings in Microsoft products may use the currency sign in patterns use to specify the formatting of monetary quantities. For example, "1,1 ¤" might be a setting that tells the system to put the currency symbol (to be specified in another setting) after the number and separated from it with a space.
In the 1960s, the international currency sign ¤ was substituted for the dollar sign $ in one internationalized version of ASCII (ISO 646). The dollar sign was restored later however, and it seems that nobody actually used the currency sign for anything. For some odd reason, it was included into ISO Latin 1 into code position of its own.
It is advisable to avoid using this character, since its code position is occupied by another character in ISO Latin 9 alias ISO 8859-15, which will probably widely replace ISO Latin 1 at least in European usage.
When data in ISO 8859-15 encoding is displayed by a program that does not support that encoding or does not properly recognize information the encoding, the program typically defaults to displaying the data as if it were ISO 8859-1 encoded. This means that an octet intended to represent the euro sign will be displayed as the currency sign, ¤.