Before revision: Origins The earliest attestation of the use of either x or o to indicate kisses identified by the Oxford English Dictionary appears in the English novellist Florence Montgomery's 1878 book Seaforth, which mentions "This letter [...] ends with the inevitable row of kisses,—sometimes expressed by × × × × ×, and sometimes by o o o o o o, according to the taste of the young scribbler".
After revision: alt=1313|AHMADOrigins The earliest attestation of the use of either x or o to indicate kisses identified by the Oxford English Dictionary appears in the English novellist Florence Montgomery's 1878 book Seaforth, which mentions "This letter [...] ends with the inevitable row of kisses,—sometimes expressed by × × × × ×, and sometimes by o o o o o o, according to the taste of the young scribbler".