Cricket scoring - Bowling analysis - Maidens/Wicket Maidens

Fig 1

Maidens and Wicket maidens

Fig 2

In fig 1 above in the 7th Over of "B.Lokes" spell we can see the symbol and method of recording a 'Maiden over' e.g. an over where no runs are incurred against the bowler. The six dot balls are recorded as the over un-folds and once the final ball has been delivered with no runs being made by the batter an M is marked over the dots to clearly indicate the Maiden.

We can see in the previous over the bowling figures were 24-0 (24 runs for 0 wickets).
The score remains the same for this over as no runs were made.

Fig 3

In Fig 3 here (Taken from the 8th over above in Fig 1)
We see the method for recording 'Wicket Maidens'. Balls one to three are dot balls and the 4th ball of the over is a wicket.

Wickets are recorded with the use of a W.

Following the wicket, the final two balls of the over are dot balls, meaning no runs have been made in the over, this is therefore a "Wicket maiden over". 

If more wickets had fallen the smaller W's would have been recorded and the over would have been a double wicket or triple wicket maiden.

With no runs the bowling tally now is 24-1 (24 runs for 1 wicket.

Fig 4

Fig 4 to the left is another example of a Maiden.
The first, 3rd, 4th and 5th deliveries are dot balls and the 2nd and last deliveries were a Bye and a Leg-Bye respectively which do not go against the bowler this therefore is another over that has incurred no runs against the bowler and is therefore a Maiden.

Note this over might have also had a wickets fall during it along with the Byes and this would have been a wicket maiden with W used instead of the M.