no reply because u can get these information in documentation easily. but i think u don't want to try hard. any way -

this information comes from dba_tab_columns. it is for backward compatibality with orace7.

low_value - low value in that particular column
high_value - high value in that particular column

you have missed out the column name in your output. the information stored is in raw format . hence 'C102' . you can check this by -

select min(column_name) from table_name
and then

select rawtohex(yourvalue) from dual;

you will get C102 .