I discovered this unique ceramic floor tile or also known as encaustic cement floor tile while helping to upright a severely damaged tomb. 
Etched on this encaustic cement floor tile is the characters CA but also importantly, it has chinese characters too ! The ones i encountered previously were characters such as KSH and TCT, This is one the rare ones i seen so far with chinese characters.
Such tiles form an important part of the material culture of Singapore, as such floor tiles can been found not only in Bukit Brown cemetery but also in heritage buildings around Singapore. However, we do not often know who were the actual makers of this tiles and whether this factories were from Singapore or not. The only one i have written and research on in some detail was the the TCT encaustic cement floor tiles - known as the Tampenis Cement Tile Works Limited (and yes that is the correct spelling and not Tampines).
Further Reading
Tampenis Cement Tile Works Limited. Rojak Librarian, posted on 13 May 2021
Saw Poo Choo Neo. Rojak Librarian, posted on 1 September 2021
Mrs. Ng Wee Yew nee Choo Lian Neo. Rojak Librarian, posted on 2 November 2025