The early clipless Shimano pedals were licensed copies of Look Delta. When they brought out the SPD type for MTB it was followed shortly by tiny Ultegra and Dura-Ace models with MTB cleats. They disappeared quickly from the market. Mainly because the range of available road shoes for two-bolt cleats was limited and the tiny contact surface put too much ...
They are single-sided SPD pedals, made by Ritchey, compatible with the common 2-bolt mountain SPD cleat. Note that there are two different, much larger road SPD cleats (SPD-SL ), that are not compatible with these.