Thumbnail is a term used by graphic designers and photographers for a small image representation of a larger image, usually intended to make it easier and faster to look at or manage a group of larger images.
Job Searching. The skills section of your resume includes your abilities that are related to the jobs you are applying for. List skills that are relevant to the position or career field that you are interested in, such as computer skills, software skills, and/or language skills.
If it is the first then you can make a list of your classes on your resume/CV fairly easily and I would agree with Nabanita's answer if that is more of what you are looking for! Ability to interact and effectively communicate with people from diverse backgrounds, highlighting teamwork and problem solving.