I take it that you're looking for a Times-Roman math font that closely (ideally: perfectly...) matches the shapes of four specific glyphs you've found in some document. These glyphs would be entered in a LaTeX document as \gamma, \beta, v, and \Delta, respectively.
For use with pdfLaTeX, I'm familiar with four font packages that provide a Times Roman-style math font: mtpro2, newtxmath (use the package option varvw to get the letters v and w with "rounded bottoms"), mathptmx, and txfonts. The complete mtpro2 package is not free of charge; however, its "lite" subset -- which is all that's needed to produce these four glyphs -- is free. mathptmx and txfonts actually provide both a text font and a math font.




The glyphs differ not only in their shapes -- most obviously in the shape of the character v -- but also in their side-bearings. E.g., while the glyphs \gamma, \beta, and \Delta provided by the newtxmath package are pretty much identical to those provided by txfonts, their side-bearings differ considerably.
Based on these screenshots, I'd say you should be using the mtpro2 package. The newtxmath package (if the option varvw is set) is probably OK as well.
If the online typesetting service (ShareLaTeX? Overleaf?) you're using doesn't provide access to the mtpro2 package, I'd say that you may want to look into (a) setting up a full TeX distribution on your own computer and (b) downloading and installing either the lite or the full version of mtpro2.
Here's the code that produced the four screenshots; un-comment one of the packages at a time in order to recreate the screenshots shown above.
\documentclass[border=1pt]{standalone}
\usepackage{array}
%\usepackage[lite]{mtpro2}
%\usepackage[varvw]{newtxmath}
%\usepackage{mathptmx}
\usepackage{txfonts}
\begin{document}
\begin{tabular}{@{} >{\ttfamily}p{2.75cm} p{1.15cm} p{0.9cm} @{}}
txfonts % select from: mtpro2[lite], newtxmath[varwv], mathptmx, txfonts
& $\gamma$ $\beta $ $v$ $\Delta$ & $\gamma\beta v\Delta$
\end{tabular}
\end{document}
Addendum, to address the OP's follow-up query: Here's an excerpt from page 7 of the user guide of MathTime Professional II font package, regarding the package's calligraphic math alphabets:

RMTMIfont: https://www.ctan.org/tex-archive/fonts/mt11p?lang=en – samcarter_is_at_topanswers.xyz Feb 24 '17 at 13:08Greek-Roman? The first 3 fonts are default. The last 4 you just load a Times clone package for. Look up theRM...one infontnameif this is a Berry font name. WhichSymbolfont? That one you probably just load the relevant symbol packages for. But combining CM maths and Times text is horrible. Don't do it. – cfr Feb 27 '17 at 23:26newtxpackage, https://www.ctan.org/pkg/newtx. – Sebastiano Feb 28 '17 at 20:22\ usepackage {newtxtext, newtxmath}or\ usepackage {mathptmx}. All I want is that I am told which packages use to have the fonts shown in the pictures. – Sebastiano Feb 28 '17 at 20:22