Where to get SymbolMT and how to use it once obtained?

Upon launching dvips or dvipdf on a certain DVI file generated today with a standard latex-bibtex loop from the current Debian-stable TeX Live, I get

dvips: Font SymbolMT used in file some_diagram.eps is not in the mapping file.

Viewing the old EPS file and the resulting PS file with gv and the resulting PDF file with evince, I see boxes at certain places instead of meaningful glyphs. (Oposed to this, a prior version of the PDF and PS files, compiled on Jul 20, 2023 CEST, probably also using packages from TeX Live in Debian stable, does have proper glyphs.)

In the compiled .tex file, we discover

\includegraphics[scale=0.5]{some_diagram.eps}

Further:

$ grep -C5 SymbolMT some_diagram.eps F /F1 0 /0 F /TTFF4D68D8t00 mF /F1S96 F1 [150 0 0 -150 0 0 ] mFSF1S96 Ji 1804 1960 M <01020304>[97 75 76  0]xS %%IncludeResource: font SymbolMTF /F2 0 /2 F /SymbolMT mF /F2S96 F2 [150 0 0 -150 0 0 ] mFSF2S96 Ji 2082 1960 M <D9>S F1S96 Ji 2207 1960 M <01>S --LH%%PageTrailer%%Trailer%%DocumentNeededResources: %%+ font SymbolMT%%DocumentSuppliedResources: %%+ procset Pscript_WinNT_ErrorHandler 5.0 0%%+ procset Pscript_FatalError 5.0 0%%+ procset Pscript_Win_Basic 5.0 0%%+ procset Pscript_Win_Utils_L2 5.0 0$ head -14 some_diagram.eps %!PS-Adobe-3.0 EPSF-3.0%%Title: Microsoft PowerPoint - some_diagram%%Creator: PScript5.dll Version 5.2.2%%CreationDate: 2/21/2009 0:17:58%%BoundingBox: 6 8 784 606%%Pages: 1%%Orientation: Landscape%%PageOrder: Ascend%%DocumentNeededResources: (atend)%%DocumentSuppliedResources: (atend)%%DocumentData: Clean7Bit%%TargetDevice: (HP LaserJet 9050 mfp) (3010.107) 0%%LanguageLevel: 2%%EndComments$ tlmgr search SymbolMT # using tlmgr from the current TeX Live 2023$ grep -a SymbolMT /path_to_a_Windows_partiton/Windows/Fonts/symbol.ttf… Symbol :version 1.70 (Microsoft)Version 5.01SymbolMTMonotype TypographyMonotype …$ ls -la /usr/local/share/fonts/Windows_Fontslrwxrwxrwx 1 root staff 28 21. Jan 02:03 /usr/local/share/fonts/Windows_Fonts -> /path_to_a_Windows_partiton/Windows/Fonts

A search on CTAN for SymbolMT leads nowhere. Any idea on how to get meaningful glyphs into the output without redrawing the visual contents of some_diagram.eps? (To this end, is, perhaps, any package of TeX Live to be installed or upgraded?)