I found this neat, unobtrusive graffiti on the south side of Vine Street between Ferguson and Custer. It’s alongside a house that faces Custer. I initially speculated that it was two sets of initials from two people in the same family, with a last name starting with M.
Checking the property records online, however, I found that in 2009 the house was sold by someone with the last name Lum. So either someone in the house was named K.L.M. Lum, or KLM were the leading initials of three members of the house (perhaps the children). The owner’s name I see in the records did not start with K, L, or M.