Flag created by CincyFlags for the neighborhood. 
Its symbolism, according to CincyFlags in [1]:
"The bright and immediately recognizable colors of Columbia Tusculum’s Victorian homes, the Painted Ladies.
A single clear blue line as an abstraction of Columbia Parkway.

A smaller, purple triangle that frames the neighborhood like the Ohio River."
Own work using: https://www.cincyflags.com/columbia-tusculum
CincyFlags