Confusion in exact term used for ?

[ift38375]

import pandas as pd
diSales= { 2016:{'qtr1':34500,'qtr2':56000,'qtr3':47000,'qtr4':49000},
           2017:{'qtr1':44900,'qtr2':46100,'qtr3':57000,'qtr4':59000},
           2018:{'qtr1':54500,'qtr2':51000,'qtr3':57000,'qtr4':58500},
           2019:{'qtr1':61000}
         }
df = pd.DataFrame(diSales)
ks = df.count()
print(ks)

in above example i am using name df, ks but what exact term i will use for that: variable or object ?

are df and ks variables or anything ? plz clarify me