\documentclass[leqno]{article}
\usepackage[utf8]{inputenc}
\usepackage[greek,english]{babel}
\usepackage{alphabeta}
\usepackage{amsmath}
\addto\captionsenglish{\renewcommand{\tablename}{πινακας}}
\usepackage{tabularx}
\author{MARIA PHYLACTOU}
\title{Practise}
\date{04-06-2021}

\begin{document}
\maketitle
o pinakas ~\ref{tbl1}
\section{πίνακας}
\begin{table}[h]
\caption{}\label{tbl1}
\begin{tabular}{|l|c|l|}\hline
\emph{number1} & \multicolumn{2}{r|}{\emph{number2}}\\ \hline
a11& b11& c11\\ \cline{3-3}
 &  & d11\\ \hline
\end{tabular}
\end{table}

\begin{equation}
x=a
\end{equation}
\end{document}
