p	commonly referred to as a small 'p'; the horse is likely to improve
P	commonly referred to as a large 'P'; the horse is capable of much better
+	the horse may be better than rated
?	the rating is suspect or (used alone) the horse is out of form or cannot be assessed with confidence
§	the 'Timeform squiggle'; the horse is unreliable (for temperamental or other reasons)
§§	the 'double squiggle'; the horse is so unsatisfactory as to be not worth a rating
x	a poor jumper
xx	so bad a jumper as to be not worth a rating