With the unaligned encoding, the bits are packed with no regard for octet (byte) boundaries. Each SNMPv3 message contains security parameters which are encoded as an octet string. Options are octet strings of varying length. Further expansions have also been produced such as the String octet by Mendelssohn. He quickly followed with the String Octet, Op. The term "octet" always refers to an 8-bit quantity. The first octet (01) includes the broadcast/multicast bit. This corresponds to an 8-dimensional ("octet") representation of the group SU(3). Each part represents a group of 8 bits (an octet) of the address. The maximum TTL value is 255, the maximum value of a single octet. The term "octet" is used to unambiguously specify a size of eight bits. Argon's complete octet of electrons indicates full s and p subshells. In the IPv4 header, TTL is the 9th octet of 20. Voces8, styled VOCES8, is an "a cappella" octet from the United Kingdom. The TOS octet and IP precedence were not widely used.