It can be a little bit vague sometimes when you're staring at a set of character stats to really get a quick image of what the character or NPC is like.

(STR 12, CON 9, SIZ 10, DEX 15, APP 14, INT 16, POW 13, EDU 17) - would you be able to give a snapshot of this person in a few words? 

Always remember that 10 is the human average, and therefore anything from 10-12 is fairly ordinary as far as people go.

Some players get in a huff if they don't roll up characters with lots of 17's and 18's. This is ridiculous. Some of the best roleplaying I have seen has come from players with characters that are average - with one strong STAT or one weak STAT.

STR & SIZ, look at the difference between these two stats. If STR is the same as SIZ then we can say the character is neither fat or toned. If the STR is more than 2 points higher than SIZ then we could say the character is toned, and with a higher difference, very toned, wirey hard physique, etc. If the SIZ is higher than STR, then it means the character has more body mass than muscle and yup, you guessed it, you're gonna have to call them fatty. I normally associate a person's SIZ to thier weight in British Stone ( multiply by 6 for kg's)

POW, this stat is sometimes overlooked by Call of Cthulhu players who are fixated on magic points - POW does have a much more day-to-day impact in GAME. This is charisma and animal magnetism. Characters with really low POW will have really low social impact and may even be considered cold, arrogant, egocentric, aloof or even hostile. Characters with high POW will come across as potential warm, certainly charming - keep their INT in mind before you start calling them urbane. An character with POW 17 can be very charming but with an INT of 6 this illusion lasts until he opens his mouth and speaks.

DEX, a low DEX would indicate the character was clumsy, or walked awkwardly with heavy feet and wooden movements, a high DEX could give a character those fluid, cat-like movements that stealthy players like to have.

INT, is the difference between your character being of average intelligence, or dropping down to the low's of George Bush or the heights of Einstein.

EDU, can be easy to classify, with (6-9) left school early, (10-11) finished school at 16'ish, (12-13) finished school at 18'ish, (14) low grade degree, (16) average degree, (18) top degree, (19) post-grad qualification, (20) Doctor, (21) Professor.