O5/23 was originally 05R/23L and there was a parallel 05L/23R. The third of the triangles was 15R/33L with a corresponding 33R/15L. There is also mention of a 16/34, but I do not recall that runway. Old charts show what might have been a 23 Centre, but I do not know if that was ever a full runway. In the early days I believe that was the piece of tarmas referred to by ATC as "Waites Alley" because a captain of that name attempted to take off on it in poor visibility. (Facts that would definitely need confirming!)
33L closed around 1968 and 23R around 1970. 05R closed many years later but so far as I know 23 (L) is still available today - at some notice and with no ILS.