Perl is an open source programming language that is similar in syntax to the C language. Presumably, the acronym stands for Larry Wall's Practical Extraction and Report Language
The currently installed versions are
on hpc-env/6.4 Perl/5.26.0-foss-2017b Perl/5.26.0-GCCcore-6.4.0 Perl/5.28.0-GCCcore-6.4.0
on hpc-uniol-env Perl/5.20.3
If you want to find out more about Perl on the HPC Cluster, you can use the command
module spider Perl
This will show you basic informations e.g. a short description and the currently installed version.
To load the desired version of the module, use the command, e.g.
module load Perl/5.28.0-GCCcore-6.4.0
Always remember: this command is case sensitive!
The full documentation as well as an FAQ can be found here.