Most alphabetic math symbols are in the Mathematical Alphanumeric Symbols block shown above. It is used for alphanumeric or numeric-only barcodes. Unicode assigns codepoints and in the Letterlike Symbols and Mathematical alphanumeric symbols ranges respectively. Phonewords are mnemonic phrases represented as alphanumeric equivalents of a telephone number. These representations included alphanumeric characters and special graphical symbols. The VGA supports both All Points Addressable graphics modes and alphanumeric text modes. A code is a set of symbols or signals that usually represent alphanumeric characters. The stenotype keyboard has far fewer keys than a conventional alphanumeric keyboard. Teleprinters generated the same code from a full alphanumeric keyboard. NetBIOS names are a sequence of alphanumeric characters. Combinations of these alphanumeric characters are assigned as codes for various standardized messages. Changing the Base32 alphabet, all alternative standards have similar combinations of alphanumeric symbols. Each code consists of seven alphanumeric characters. It provides an efficient method of displaying alphanumeric characters. It was the first watch/pager able to receive alphanumeric messages.