01111111

01111111 is an eight-bit binary numeral. When interpreted as an unsigned binary value, it equals 127. In two's complement representation, which is standard for 8-bit integers in many systems, 01111111 is the maximum positive value, while 10000000 represents −128. The pattern consists of a leading zero and seven trailing ones, i.e., it equals 2^7 − 1.

In ASCII and related 7-bit encodings, the hexadecimal equivalent 0x7F corresponds to the DEL (delete) control character. It is a nonprinting character historically used to erase previously printed or stored characters on devices such as teletypes and punched tape. In modern text processing, DEL is typically not displayed as a printable symbol.

Practical uses of this bit pattern include bit masking and value boundaries. ANDing a byte with 0x7F clears the most significant bit, leaving the lower seven bits intact. The value also marks the upper limit of 7-bit ASCII; many systems treat the high bit as non-significant to maintain compatibility with seven-bit character sets. In hexadecimal, the value is commonly represented as 0x7F, corresponding to the decimal 127.