c - What does "s" mean in structure?

Here's a simple question. What's the meaning of the leading letter "s" in the sin_family, sin_port, sin_addr and sin_zero?

struct sockaddr_in {
    short int          sin_family;  // Address family, AF_INET
    unsigned short int sin_port;    // Port number
    struct in_addr     sin_addr;    // Internet address
    unsigned char      sin_zero[8]; // Same size as struct sockaddr


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